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#include <nftables.h>
#include <expression.h>
#include <utils.h>
#include <string.h>
#include <osf.h>
#include <json.h>

static const char *osf_ttl_int_to_str(const uint8_t ttl)
{
	if (ttl == 1)
		return "ttl loose ";
	else if (ttl == 2)
		return "ttl skip ";

	return "";
}

static void osf_expr_print(const struct expr *expr, struct output_ctx *octx)
{
	const char *ttl_str = osf_ttl_int_to_str(expr->osf.ttl);

	nft_print(octx, "osf %sname", ttl_str);
}

static void osf_expr_clone(struct expr *new, const struct expr *expr)
{
	new->osf.ttl = expr->osf.ttl;
}

static bool osf_expr_cmp(const struct expr *e1, const struct expr *e2)
{
	return e1->osf.ttl == e2->osf.ttl;
}

static const struct expr_ops osf_expr_ops = {
	.type		= EXPR_OSF,
	.name		= "osf",
	.print		= osf_expr_print,
	.clone		= osf_expr_clone,
	.cmp		= osf_expr_cmp,
	.json		= osf_expr_json,
};

struct expr *osf_expr_alloc(const struct location *loc, const uint8_t ttl)
{
	unsigned int len = NFT_OSF_MAXGENRELEN * BITS_PER_BYTE;
	const struct datatype *type = &string_type;
	struct expr *expr;

	expr = expr_alloc(loc, &osf_expr_ops, type,
			  BYTEORDER_HOST_ENDIAN, len);
	expr->osf.ttl = ttl;

	return expr;
}